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. In
sanguineous animals this one-ness is not only actual but potential,
whereas in some bloodless animals it is only actual. Where, however,
the sensory soul is lodged, there also and in the selfsame place
must necessarily be the source of heat; and, again, where this is
there also must be the source of the blood, seeing that it thence
derives its warmth and fluidity. Thus, then, in the oneness of the
part in which is lodged the prime source of sensation and of heat is
involved the one-ness of the source in which the blood originates; and
this, again, explains why the blood-vessels have one common
starting-point.
The vessels, again, are two, because the body of every sanguineous
animal that is capable of locomotion is bilateral; for in all such
animals there is a distinguishable before and behind, a right and
left, an above and below. Now as the front is more honourable and of
higher supremacy than the hinder aspect, so also and in like degree is
the great vessel superior to the aorta. For the great vessel is placed
in front, while the aorta is behind; the former again is plainly
visible in all sanguineous animals, while the latter is in some
indistinct and in some not discernible at all.
Lastly, the reason for the vessels being distributed throughout
the entire body is that in them, or in parts analogous to them, is
contained the blood, or the fluid which in bloodless animals takes the
place of blood, and that the blood or analogous fluid is the
material from which the whole body is made
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